use statistics instead of statistic

lib/generators/simple_controller/templates/views/index.json.jbuilder

 json.current_page @<%= resource_plural %>.current_page
 json.total_pages @<%= resource_plural %>.total_pages
 json.total_count @<%= resource_plural %>.count
-json.statistic @statistic if @statistic.present?
+json.statistics @statistics if @statistics.present?
 
 json.records @<%= resource_plural %>, partial: '<%= view_path %>/simple', as: :<%= resource_singular %>

lib/simple_controller/base_controller.rb

@@ -176,8 +176,8 @@ class SimpleController::BaseController < ::InheritedResources::Base
   # 执行sub_q
   def ransack_paginate(association)
     if params[:group_keys].present?
-      statistic_association = association.unscope(:order).distinct
-      @statistic = statistic_association.group(params[:group_keys]).count.merge(count: statistic_association.count)
+      statistics_association = association.unscope(:order).distinct
+      @statistics = statistics_association.group(params[:group_keys]).count.merge(count: statistics_association.count)
     end
 
     association = association.ransack(params[:sub_q]).result unless self.class.instance_variable_get(:@ransack_off) || params[:sub_q].blank?